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e5329c37 NB |
1 | /* |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au> | |
5 | * | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | * Author: Neil Brown | |
22 | * Email: <neilb@cse.unsw.edu.au> | |
23 | * Paper: Neil Brown | |
24 | * School of Computer Science and Engineering | |
25 | * The University of New South Wales | |
26 | * Sydney, 2052 | |
27 | * Australia | |
28 | */ | |
29 | #include "mdadm.h" | |
30 | #include "dlink.h" | |
31 | ||
32 | #if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN) | |
33 | #error no endian defined | |
34 | #endif | |
35 | #include "md_u.h" | |
36 | #include "md_p.h" | |
37 | ||
38 | int Grow_Add_device(char *devname, int fd, char *newdev) | |
39 | { | |
40 | /* Add a device to an active array. | |
41 | * Currently, just extend a linear array. | |
42 | * This requires writing a new superblock on the | |
43 | * new device, calling the kernel to add the device, | |
44 | * and if that succeeds, update the superblock on | |
45 | * all other devices. | |
46 | * This means that we need to *find* all other devices. | |
47 | */ | |
4b1ac34b NB |
48 | struct mdinfo info; |
49 | ||
50 | void *super = NULL; | |
e5329c37 NB |
51 | struct stat stb; |
52 | int nfd, fd2; | |
53 | int d, nd; | |
54 | ||
55 | ||
4b1ac34b | 56 | if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) { |
e5329c37 NB |
57 | fprintf(stderr, Name ": cannot get array info for %s\n", devname); |
58 | return 1; | |
59 | } | |
60 | ||
4b1ac34b | 61 | if (info.array.level != -1) { |
e5329c37 NB |
62 | fprintf(stderr, Name ": can only add devices to linear arrays\n"); |
63 | return 1; | |
64 | } | |
65 | ||
66 | nfd = open(newdev, O_RDWR|O_EXCL); | |
67 | if (nfd < 0) { | |
68 | fprintf(stderr, Name ": cannot open %s\n", newdev); | |
69 | return 1; | |
70 | } | |
71 | fstat(nfd, &stb); | |
72 | if ((stb.st_mode & S_IFMT) != S_IFBLK) { | |
73 | fprintf(stderr, Name ": %s is not a block device!\n", newdev); | |
74 | close(nfd); | |
75 | return 1; | |
76 | } | |
77 | /* now check out all the devices and make sure we can read the superblock */ | |
4b1ac34b | 78 | for (d=0 ; d < info.array.raid_disks ; d++) { |
e5329c37 NB |
79 | mdu_disk_info_t disk; |
80 | char *dv; | |
81 | ||
82 | disk.number = d; | |
83 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) { | |
84 | fprintf(stderr, Name ": cannot get device detail for device %d\n", | |
85 | d); | |
86 | return 1; | |
87 | } | |
88 | dv = map_dev(disk.major, disk.minor); | |
89 | if (!dv) { | |
90 | fprintf(stderr, Name ": cannot find device file for device %d\n", | |
91 | d); | |
92 | return 1; | |
93 | } | |
94 | fd2 = open(dv, O_RDWR); | |
95 | if (!fd2) { | |
96 | fprintf(stderr, Name ": cannot open device file %s\n", dv); | |
97 | return 1; | |
98 | } | |
4b1ac34b NB |
99 | if (super) free(super); |
100 | super= NULL; | |
101 | if (load_super0(fd2, &super, NULL)) { | |
e5329c37 NB |
102 | fprintf(stderr, Name ": cannot find super block on %s\n", dv); |
103 | close(fd2); | |
104 | return 1; | |
105 | } | |
106 | close(fd2); | |
107 | } | |
108 | /* Ok, looks good. Lets update the superblock and write it out to | |
109 | * newdev. | |
110 | */ | |
111 | ||
4b1ac34b NB |
112 | info.disk.number = d; |
113 | info.disk.major = major(stb.st_rdev); | |
114 | info.disk.minor = minor(stb.st_rdev); | |
115 | info.disk.raid_disk = d; | |
116 | info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE); | |
117 | update_super0(&info, super, "grow", newdev, 0); | |
e5329c37 | 118 | |
4b1ac34b | 119 | if (store_super0(nfd, super)) { |
e5329c37 NB |
120 | fprintf(stderr, Name ": Cannot store new superblock on %s\n", newdev); |
121 | close(nfd); | |
122 | return 1; | |
123 | } | |
e5329c37 | 124 | close(nfd); |
4b1ac34b NB |
125 | |
126 | if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) { | |
e5329c37 NB |
127 | fprintf(stderr, Name ": Cannot add new disk to this array\n"); |
128 | return 1; | |
129 | } | |
130 | /* Well, that seems to have worked. | |
131 | * Now go through and update all superblocks | |
132 | */ | |
133 | ||
4b1ac34b | 134 | if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) { |
e5329c37 NB |
135 | fprintf(stderr, Name ": cannot get array info for %s\n", devname); |
136 | return 1; | |
137 | } | |
138 | ||
139 | nd = d; | |
4b1ac34b | 140 | for (d=0 ; d < info.array.raid_disks ; d++) { |
e5329c37 NB |
141 | mdu_disk_info_t disk; |
142 | char *dv; | |
143 | ||
144 | disk.number = d; | |
145 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) { | |
146 | fprintf(stderr, Name ": cannot get device detail for device %d\n", | |
147 | d); | |
148 | return 1; | |
149 | } | |
150 | dv = map_dev(disk.major, disk.minor); | |
151 | if (!dv) { | |
152 | fprintf(stderr, Name ": cannot find device file for device %d\n", | |
153 | d); | |
154 | return 1; | |
155 | } | |
156 | fd2 = open(dv, O_RDWR); | |
157 | if (fd2 < 0) { | |
158 | fprintf(stderr, Name ": cannot open device file %s\n", dv); | |
159 | return 1; | |
160 | } | |
4b1ac34b | 161 | if (load_super0(fd2, &super, NULL)) { |
e5329c37 NB |
162 | fprintf(stderr, Name ": cannot find super block on %s\n", dv); |
163 | close(fd); | |
164 | return 1; | |
165 | } | |
4b1ac34b NB |
166 | info.array.raid_disks = nd+1; |
167 | info.array.nr_disks = nd+1; | |
168 | info.array.active_disks = nd+1; | |
169 | info.array.working_disks = nd+1; | |
170 | info.disk.number = nd; | |
171 | info.disk.major = major(stb.st_rdev); | |
172 | info.disk.minor = minor(stb.st_rdev); | |
173 | info.disk.raid_disk = nd; | |
174 | info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE); | |
175 | update_super0(&info, super, "grow", dv, 0); | |
176 | ||
177 | if (store_super0(fd2, super)) { | |
e5329c37 NB |
178 | fprintf(stderr, Name ": Cannot store new superblock on %s\n", dv); |
179 | close(fd2); | |
180 | return 1; | |
181 | } | |
182 | close(fd2); | |
183 | } | |
184 | ||
185 | return 0; | |
186 | } |